Comparison of a simple and a spatially distributed hydrologic model for the simulation of a lowland catchment in Northern Germany |
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| Institution: | 1. Department of Biology, University of Antwerp, Universiteitsplein 1, 2610 Wilrijk, Belgium;2. Laboratory of Plant Ecology, Department of Applied Ecology and Environmental Biology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium;3. Centre for Ecosystems and Environmental Sustainability, Department of Chemical and Biochemical Engineering, Technical University of Denmark, 2800 Kongens Lyngby, Denmark;4. Institute of Agroenvironmental and Forest Biology, National Research Council of Italy (CNR-IBAF), Via Salaria km 29.300, 00015 Monterotondo (Rome), Italy;5. Institute for Agriculture and Forest Systems in the Mediterranean, CNR, Via Cavour 4-6, 87036 Rende, Italy;6. Department of Bioscience Engineering, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium;7. Forest Ecology and Ecophysiology Unit, UMR INRA UHP, 54280 Champenoux, France;1. Applied Chemistry Department, S. V. National Institute of Technology, Surat 395 007, India;2. Department of Chemistry, V.N. South Gujarat University, Udhna-Magdalla Road, Surat 395 007, India;1. Research School of Engineering, The Australian National University (ANU), Canberra, ACT 0200, Australia;2. Fenner School of Environment and Society, ANU, Australia;3. Photobioenergetics Group, Research School of Biology (RSB), ANU, Australia;1. School of Information Science and Engineering, Xiamen University, Xiamen 361005, China;2. School of Electrical & Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore;1. CNIT - University of Genoa Research Unit - Genoa, Italy;2. DITEN - University of Genoa - Genoa, Italy;1. National Research Tomsk Polytechnic University, Institute of Non-Destructive Testing, 634050 Tomsk, Russia;2. V.E. Zuev Institute of Atmospheric Optics SB RAS, 634055 Tomsk, Russia |
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| Abstract: | This paper describes the application of two simple models for runoff simulation of the Kielstau, a small wetland catchment in Northern Germany. The first one is SIMPEL, a one-dimensional spreadsheet model for soil water balance and runoff for small catchments; the second one is KIDS, Kielstau discharge simulation model, which is written in the PCRaster dynamic modelling language. KIDS uses the algorithms of SIMPEL, but applies them to a spatial database.The basic version of both models fails to reproduce the measured hydrograph for a flat region in Northern Germany with ca. 30% wetlands. Additionally, the water balance of the region cannot be closed, the relative discharge is lower than in the neighbouring catchments which means that ET must be higher. After the creation of an additional wetland compartment module where ETa equals ETp, the hydrographs could be matched. In a second step, we used inverse modelling with the SIMPEL model to evaluate the range of input parameters and possible sources of the low outflow of the catchment. We found that the low discharge can only be modelled if the evaporation is increased substantially. A wetland fraction of 0.3 produced the best results in inverse modelling runs, this value was also estimated based on the available maps. |
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